High frequency energy line



Jan. 16, 1940. A GOTHE 2,187,584

HIGH FREQUENCY ENERGY LINE Filed April 21, 1937 Referring now in detailto the drawing, with- Patented Jan. 16, 1940 NlTl-:D STATES PATENTOFFICE HIGH FREQUENCY ENERGY LINE Albrecht Gothe, Berlin, Germany,assignor to i Telefunken Gesellschaft fr Drahtlose Telegraphie m. b. H.,Berlin, Germany, a corporation of Germany Application April 21, 1937,Serial No. 138,113

, In Germany April 6, 1936 11 Claims.

In concentric high frequency energy lines as known in the prior art,diiiiculties are frequently encountered due to the construction of theinsulation retained by the inner conductor and bearing against the outerconductor, causing corona eilects to occur at high voltages. If the twoconcentric conductors are to be insulated in the manner known in theprior art, for example by means of disks or rings, the latter must besecurely fastened to the inner conductor, otherwise, at the existing airgaps very high eld intensities would appear, giving rise to undesiredcorona eiects. 'I'he manufacture of concentric transmission lines asknown inthe prior art with the use of insulating disks or rings involvesa problem which makes it very diiiicult to prevent corona effects andthe construction is quite expensive.

It has been proposed to maintain the distance between the innerconductor and the outer c onductor by means of insulating rods which arepassed through an ordinarily tubular inner conductor and rest with theirends against the inside oi the outer conductor. Also, in this case thereis the danger of corona effects between the insulating rods and theedges of the bores of the inner conductor through which the rods aremechanically inserted. In order to avoid the danger of corona eiects insuch concentric lines insulated by means of rods, the rods according to.

the present invention are provided with two grooves into which elasticmetal rings are placed whose external distance of the outside diameterand width of the ring is smaller than the diameter of the innerconductor of the energy line, so that when the metal rings abut againstilat seats or depressions provided at the inner conductor, the electricfield will not be altered. The flat portions are produced by depressingthe borders of the bores of the inner conductor.

The invention will be elucidated by Figs. 1 to 5, inclusive of thedrawing, in which:

Fig. 1 is a longitudinal view of a concentric conductor;

Flg. 2 is a cross-section of Fig. 1;

Fig. 3 is a detail of an insulating spacer;

Fig. 4 is a detail of a corrugated tube; and

Fig. 5 is a detail of a spiral ring.

'Qin the tubular outer conductor I there extends a insulated inapproximately equal distances against the outer conductor by means oftwo insulating rods 3 and 4 passed through the inner conductor closelyspaced from and arranged at right angle to each other and resting withtheir ends on the inside of the outer conductor. The borders of thebores of the inner conductor are pressed inwardly so that roundseat-like depressions are obtained. On the insulating rods at a distanceA from each other, two grooves 5 are provided. The distance A is alwaysmade smaller than the diameter D of the inner conductor, so that themaximum overall dimension of rings 6 will not exceed the outsidediameter of tube 2. Into these grooves 5 the split spring-like metalrings 6 are inserted which rest tightly against grooves in theinsulating rods, as well as against the sunken-in edges of the bores.'Ihe grooves 5 are preferably metallized so that between the innerconductor and the insulating rod no air gaps can appear. The metal ringsmay be formed of corrugated tubings or wire spirals as shown by Figs. 4and 5, respectively. They serve in the first place to-assure a. coronasafe abutting of the insulating rods against the inner conductor. InView of the fact that the all-over distance between the metal rings issmaller than the diameter of the inner conductor, no increases in thefield strength between inner conductor and outer conductor appear.Furthermore, the metal rings have the task of mechanically securing theinsulating rods in place and preventing a displacement of the innerconductor.

The Figures 1 and 2 of the drawing indicate that the inner conductortogether with the insulating rods form a separate mechanically sturdystructure which can be separately produced and subsequently insertedinto the outer conductor.

What is claimed is:

l. A concentric high frequency line for the transmission of highvoltages comprising an inner' and an outer conductor, means for spacingsaid conductors apart, said means comprising a plurality of insulatingmembers arranged to pass through apertures in flattened portions on saidinner conductor, a groove on each one of said insulating members, and anelastic member co-operating with the groove on each insulating member tosecure them on said flattened portions of the inner conductor so thatthe electric field between said inner and outer conductor is notaltered.

2. A `concentric high frequency line for the transmission of highvoltages comprising an inner and an outer conductor, means for spacingsaid conductors apart, said means comprising a plurality of insulatingmembers arranged in groups to pass through apertures in flattenedportions on said inner conductor, a groove on each one of saidinsulating members, and an elastic member co-operating with the grooveon each insulating member to secure them on said flattened portions ofthe inner conductor so that the electric field between said inner andouter conductor is not altered.

3. A concentric high frequency line for the transmission of highvoltages comprising an inner and an outer conductor, means for spacingsaid conductors apart, said means comprising aA plurality of insulatingmembers arranged in pairs to pass through apertures in flattenedportions on said inner conductona groove o n I each one of saidinsulating members, and an elastic member co-operating with the saidgroove on ,each insulating member to secure themon said flattenedportions of the inner conductor so that the electric field between saidinner and outer conductors is not altered.

4.. A concentric high frequency line for the transmission of highvoltages comprising an inner and an outer conductor, means for spacingsaid conductors apart, said means comprising a plurality of insulatingmembers arranged in pairs locatedat right angles from each other to`pass through apertures in flattened portions on said inner conductor, agroove on each one of said insulating members, and an elastic memberco-operating with the groove on each insulated member to secure them onsaid flattened portions of the inner conductor so that electric fieldbetween said inner and outer conductor is not altered.

5. A concentric high frequency line for the transmission 'of highvoltages comprising an inner vand an outer conductor, means for spacingsaid conductors apart, said means comprising a plurality of insulatingmembers arranged in groups to pass through apertures in iiattenedportions on said inner conductor, a pair of annular grooves on eachinsulating member, and an elastic metal ring co-operating with each oneof said grooves on said insulating members to secure them on saidattened portions of the inner conductor so 'that the electric eldbetweensaid inner and outer conductor is not altered.

6. A concentric high frequency `line for the transmission of highvoltages comprising an inner and an outer conductor, means for spacingsaid conductors apart, said means comprising a plurality of insulatingmembers arranged to pass through apertures in iiattened portions on saidinner conductor, an annular groove having a metallized surface on eachone of said insulating members, and an elastic metal ring co-operatingwith the grooves on each one of said insulating members to secure themon said attened portions of the inner conductor so that the electricfield between said inner and outer conductor is not altered.

7. A concentric high frequency line for the 'transmission of highvoltages comprising an inner and an outer conductor, means for spacingsaid conductors apart, said means comprising a plurality of insulatingmembers arranged to pass through apertures in flattened portions on saidinner conductor, a groove on each one of said insulating members, and anelastic metallic wirel spiral co-operating with the groove on each oneof said insulating members to secure them on said fiattened portions ofthe inner conductor so that the electric field between said inner andouter conductor is not altered.

8. A concentric high frequency line for the transmissionI of highvoltages comprising an inner and an outer conductor, said innerconductor having a plurality of attened portions thereon, an aperturelocated in each flattened portion, said apertures arranged in pairs, apair of apertures being closely adjacent another pair but angularlydisposed to each other, a plurality of insulating members located insaid apertures, each member having grooves thereon, elastic meanslocated to rest on said iiattened portions, said means cooperating withthe grooves on said insulating members 'to space said conductors apartso that the electric field between said inner and outer conductor is notaltered.

9. A concentric high frequency .line for the transmission of highvoltages comprising an inner and an outer conductor, means for spacingsaid conductors apart, said means comprising a plurality of insulatingmembers arranged to pass through apertures in flattened portions on saidinner rconductor; an annular groove on each one of said insulatingmembers, and an elastic metallic corrugated tube co-operating with thegroove on each insulating member to secure theml on said iiattenedportions of the inner conductor so that the electric field between saidinner and outer conductor is not altered. 10. A concentric highfrequency line for thel transmission of high voltages comprising aninner and an outer conductor, means for spacing said conductors apart,said means comprising a plurality of insulating members passing throughapertures in said inner conductor and arranged to pass through said`apertures located on iiat tened portions on said inner conductor, anannular groove on each one of said insulating members,and an elasticmetal ring co-operating with the groove on each insulating member tosecure them' on said attened portions of the inner conductor so that'theelectric field between said inner and outer conductor is not altered.

l1. A concentrichigh frequency line for the transmission of highvoltages comprising an inner and an outer conductor, means for spacing'-said conductors apart, said means comprising a pair of insulatingmembers arranged at right angles from each other and passing throughapertures in said inner conductor, said apertures located at fiattenedportions on said inner con-- ductor, an annular groove on each one ofsaid insulating members, andan elastic metal ring cooperating with eachgroove on each insulating member to secure them on said flattenedportions 'of the inner conductor so that the electric field between saidinner and outer conductor is not altered.

ALBRECHT GOTHE.

